1393c3a3f4
&str can be turned into @~str on demand, using to_owned(), so for strings, we can create a specialized interner that accepts &str for intern() and find() but stores and returns @~str.
109 lines
3.4 KiB
Rust
109 lines
3.4 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use driver::session::Session;
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use syntax::ast;
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use syntax::attr;
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use syntax::codemap;
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use syntax::codemap::dummy_sp;
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use syntax::fold;
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static CORE_VERSION: &'static str = "0.7-pre";
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pub fn maybe_inject_libcore_ref(sess: Session,
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crate: @ast::crate) -> @ast::crate {
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if use_core(crate) {
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inject_libcore_ref(sess, crate)
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} else {
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crate
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}
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}
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fn use_core(crate: @ast::crate) -> bool {
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!attr::attrs_contains_name(crate.node.attrs, ~"no_core")
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}
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fn inject_libcore_ref(sess: Session,
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crate: @ast::crate) -> @ast::crate {
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fn spanned<T:Copy>(x: T) -> codemap::spanned<T> {
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codemap::spanned { node: x, span: dummy_sp() }
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}
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let precursor = @fold::AstFoldFns {
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fold_crate: |crate, span, fld| {
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let n1 = sess.next_node_id();
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let vi1 = @ast::view_item {
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node: ast::view_item_extern_mod(
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sess.ident_of("core"), ~[], n1),
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attrs: ~[
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spanned(ast::attribute_ {
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style: ast::attr_inner,
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value: @spanned(ast::meta_name_value(
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@~"vers",
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spanned(ast::lit_str(@CORE_VERSION.to_str()))
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)),
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is_sugared_doc: false
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})
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],
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vis: ast::private,
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span: dummy_sp()
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};
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let vis = vec::append(~[vi1], crate.module.view_items);
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let mut new_module = ast::_mod {
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view_items: vis,
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../*bad*/copy crate.module
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};
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new_module = fld.fold_mod(&new_module);
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// FIXME #2543: Bad copy.
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let new_crate = ast::crate_ {
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module: new_module,
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..copy *crate
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};
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(new_crate, span)
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},
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fold_mod: |module, fld| {
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let n2 = sess.next_node_id();
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let prelude_path = @ast::Path {
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span: dummy_sp(),
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global: false,
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idents: ~[
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sess.ident_of("core"),
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sess.ident_of("prelude")
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],
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rp: None,
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types: ~[]
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};
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let vp = @spanned(ast::view_path_glob(prelude_path, n2));
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let vi2 = @ast::view_item { node: ast::view_item_use(~[vp]),
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attrs: ~[],
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vis: ast::private,
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span: dummy_sp() };
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let vis = vec::append(~[vi2], module.view_items);
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// FIXME #2543: Bad copy.
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let new_module = ast::_mod {
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view_items: vis,
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..copy *module
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};
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fold::noop_fold_mod(&new_module, fld)
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},
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..*fold::default_ast_fold()
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};
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let fold = fold::make_fold(precursor);
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@fold.fold_crate(crate)
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}
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